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Unformatted text preview: Highest bond energy? Shortest bond length? O 2 , O 2-, O 2 2-7. The structure for caffeine, present in coffee and many soft drinks, is shown below. How many π bonds are present in caffeine? How many σ bonds? Insert the lone pairs in the molecules. What kind of orbitals to the lone pairs occupy? C C C N N C N CH N O O CH 3 C H 3 CH 3 8. The structure for acetylsalicylic acid (aspirin) is shown below. How many π bonds are present in aspirin? How many σ bonds? C CH C CH C H C H C OH O O C O CH 3 9. Draw Lewis structures and MO diagrams for CN + , CN, and CN-. According to the Lewis structures, which species is most stable? According to MO theory, which species is most stable? Do the two theories agree? 10. The species NO 2 + , and NO 2-, in which N is the central atom, have very different bond angles. Predict what these bond angles might be. What would you predict for NO 2 ?...
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This note was uploaded on 07/22/2008 for the course CHEM 105A taught by Professor Bau during the Summer '04 term at USC.
- Summer '04